package com.qixing.refresh_utils;

import java.lang.ref.WeakReference;
import java.util.Timer;
import java.util.TimerTask;

import com.example.qixingtianxia.R;


import android.content.Context;
import android.os.AsyncTask;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AnimationUtils;
import android.view.animation.LinearInterpolator;
import android.view.animation.RotateAnimation;
import android.widget.RelativeLayout;
import android.widget.TextView;

/**
 * 自定义的布局，用来管理三个子控件，其中一个是下拉头，一个是包含内容的pullableView（可以是实现Pullable接口的的任何View），
 * 还有一个上拉头，更多详解见博客http://blog.csdn.net/zhongkejingwang/article/details/38868463
 * 
 * @author 陈靖
 */
public class PullToRefreshLayout extends RelativeLayout
{
	public static final String TAG = "PullToRefreshLayout";
	// 初始状态
	public static final int INIT = 0;
	// 释放刷新
	public static final int RELEASE_TO_REFRESH = 1;
	// 正在刷新
	public static final int REFRESHING = 2;
	// 释放加载
	public static final int RELEASE_TO_LOAD = 3;
	// 正在加载
	public static final int LOADING = 4;
	// 操作完毕
	public static final int DONE = 5;
	// 当前状态
	private int state = INIT;
	// 刷新回调接口
	private OnPullListener mListener;
	// 刷新成功
	public static final int SUCCEED = 0;
	// 刷新失败
	public static final int FAIL = 1;
	// 按下Y坐标，上一个事件点Y坐标
	private float downY, lastY;

	// 下拉的距离。注意：pullDownY和pullUpY不可能同时不为0
	public float pullDownY = 0;
	// 上拉的距离
	private float pullUpY = 0;

	// 释放刷新的距离
	private float refreshDist = 200;
	// 释放加载的距离
	private float loadmoreDist = 200;

	private MyTimer timer;
	// 回滚速度
	public float mMoveSpeed = 8;
	// 第一次执行布局
	private boolean isLayout = false;
	// 在刷新过程中滑动操作
	private boolean isTouch = false;
	// 手指滑动距离与下拉头的滑动距离比，中间会随正切函数变化
	private float radio = 2;

	// 下拉箭头的转180°动画
	private RotateAnimation reverseUpAnimation;
	private RotateAnimation reverseDownAnimation;
	// 均匀旋转动画
	private RotateAnimation refreshingAnimation;

	// 默认下拉头
	private View defaultRefreshView;
	// 下拉的箭头
	private View pullDownView;
	// 正在刷新的图标
	private View refreshingView;
	// 刷新结果图标
	private View refreshStateImageView;
	// 刷新结果：成功或失败
	private TextView refreshStateTextView;

	// 默认上拉头
	private View defaultLoadmoreView;
	// // 上拉的箭头
	private View pullUpView;
	// 正在加载的图标
	private View loadingView;
	// 加载结果图标
	private View loadStateImageView;
	// 加载结果：成功或失败
	private TextView loadStateTextView;

	// 实现了Pullable接口的View
	private View pullableView;
	// 过滤多点触碰
	private int mEvents;
	// 这两个变量用来控制pull的方向，如果不加控制，当情况满足可上拉又可下拉时没法下拉
	private boolean mCanPullDown = true;
	private boolean mCanPullUp = true;

	private boolean mPullDownEnable = true;
	private boolean mPullUpEnable = true;

	// 执行自动回滚的handler
	private Handler updateHandler;

	// 自定义下拉头
	private View customRefreshView;
	// 自定义上拉头
	private View customLoadmoreView;
	// 下拉刷新过程监听器
	private OnPullProcessListener mOnRefreshProcessListener;
	// 上拉加载更多过程监听器
	private OnPullProcessListener mOnLoadmoreProcessListener;

	// 下拉头
	private View refreshView;
	// 上拉头
	private View loadmoreView;

	public PullToRefreshLayout(Context context)
	{
		this(context, null, 0);
	}

	public PullToRefreshLayout(Context context, AttributeSet attrs)
	{
		this(context, attrs, 0);
	}

	public PullToRefreshLayout(Context context, AttributeSet attrs, int defStyle)
	{
		super(context, attrs, defStyle);
		initView(context, attrs, defStyle);
	}

	private void initView(Context context, AttributeSet attrs, int defStyle)
	{
		updateHandler = new UpdateHandler(this);
		timer = new MyTimer(updateHandler);
		reverseUpAnimation = (RotateAnimation) AnimationUtils.loadAnimation(
				context, R.anim.reverse_up_anim);
		reverseDownAnimation = (RotateAnimation) AnimationUtils.loadAnimation(
				context, R.anim.reverse_down_anim);
		refreshingAnimation = (RotateAnimation) AnimationUtils.loadAnimation(
				context, R.anim.rotating_anim);
		// 添加匀速转动动画
		LinearInterpolator lir = new LinearInterpolator();
		reverseUpAnimation.setInterpolator(lir);
		refreshingAnimation.setInterpolator(lir);

		// 添加上拉头和下拉头
		LayoutInflater inflater = LayoutInflater.from(context);
		defaultRefreshView = inflater.inflate(R.layout.refresh_head, this,
				false);
		refreshView = defaultRefreshView;
		defaultLoadmoreView = inflater.inflate(R.layout.load_more, this, false);
		loadmoreView = defaultLoadmoreView;
		addView(defaultRefreshView);
		addView(defaultLoadmoreView);
	}

	/**
	 * 获取可拉取的视图
	 * 
	 * @return
	 */
	public View getPullableView()
	{
		for (int i = 0; i < getChildCount(); i++)
		{
			View v = getChildAt(i);
			if (v instanceof Pullable)
			{
				pullableView = v;
				return pullableView;
			}
		}
		return pullableView;
	}

	/**
	 * 设置自定义下拉头
	 * 
	 * @param v
	 */
	public void setCustomRefreshView(View v)
	{
		customRefreshView = v;
		removeView(defaultRefreshView);
		addView(customRefreshView);
		refreshView = customRefreshView;
	}

	/**
	 * 设置自定义上拉头
	 * 
	 * @param v
	 */
	public void setCustomLoadmoreView(View v)
	{
		customLoadmoreView = v;
		removeView(defaultLoadmoreView);
		addView(customLoadmoreView);
		loadmoreView = customLoadmoreView;
	}


	private void hide()
	{
		timer.schedule(5);
	}

	/**
	 * 完成刷新操作，显示刷新结果。注意：刷新完成后一定要调用这个方法
	 */
	/**
	 * @param refreshResult
	 *            PullToRefreshLayout.SUCCEED代表成功，PullToRefreshLayout.FAIL代表失败
	 */
	public void refreshFinish(int refreshResult)
	{
		if (null != mOnRefreshProcessListener)
		{
			mOnRefreshProcessListener.onFinish(refreshView,
					OnPullProcessListener.REFRESH);
		}
		if (null == customRefreshView)
		{
			refreshingView.clearAnimation();
			refreshingView.setVisibility(View.GONE);
		}
		switch (refreshResult)
		{
		case SUCCEED:
			// 刷新成功
			if (null == customRefreshView)
			{
				refreshStateImageView.setVisibility(View.VISIBLE);
				refreshStateTextView.setText(R.string.refresh_succeed);
				refreshStateImageView
						.setBackgroundResource(R.drawable.refresh_succeed);
			}
			break;
		case FAIL:
		default:
			// 刷新失败
			if (null == customRefreshView)
			{
				refreshStateImageView.setVisibility(View.VISIBLE);
				refreshStateTextView.setText(R.string.refresh_fail);
				refreshStateImageView
						.setBackgroundResource(R.drawable.refresh_failed);
			}
			break;
		}
		if (pullDownY > 0)
		{
			// 刷新结果停留1秒
			new RemainHandler(this).sendEmptyMessageDelayed(0, 1000);
		} else
		{
			changeState(DONE);
			hide();
		}
	}

	/**
	 * 加载完毕，显示加载结果。注意：加载完成后一定要调用这个方法
	 * 
	 * @param refreshResult
	 *            PullToRefreshLayout.SUCCEED代表成功，PullToRefreshLayout.FAIL代表失败
	 */
	public void loadmoreFinish(int refreshResult)
	{
		if (null != mOnLoadmoreProcessListener)
		{
			mOnLoadmoreProcessListener.onFinish(loadmoreView,
					OnPullProcessListener.LOADMORE);
		}
		if (null == customLoadmoreView)
		{
			loadingView.clearAnimation();
			loadingView.setVisibility(View.GONE);
		}

		switch (refreshResult)
		{
		case SUCCEED:
			// 加载成功
			if (null == customLoadmoreView)
			{
				loadStateImageView.setVisibility(View.VISIBLE);
				loadStateTextView.setText(R.string.load_succeed);
				loadStateImageView
						.setBackgroundResource(R.drawable.load_succeed);
			}
			break;
		case FAIL:
		default:
			// 加载失败
			if (null == customLoadmoreView)
			{
				loadStateImageView.setVisibility(View.VISIBLE);
				loadStateTextView.setText(R.string.load_fail);
				loadStateImageView
						.setBackgroundResource(R.drawable.load_failed);
			}
			break;
		}
		if (pullUpY < 0)
		{
			// 刷新结果停留1秒
			new RemainHandler(this).sendEmptyMessageDelayed(0, 1000);
		} else
		{
			changeState(DONE);
			hide();
		}
	}

	private void changeState(int to)
	{
		state = to;
		switch (state)
		{
		case INIT:
			if (null != mOnRefreshProcessListener)
			{
				mOnRefreshProcessListener.onPrepare(refreshView,
						OnPullProcessListener.REFRESH);
			}
			if (null != mOnLoadmoreProcessListener)
			{
				mOnLoadmoreProcessListener.onPrepare(loadmoreView,
						OnPullProcessListener.LOADMORE);
			}
			// 下拉布局初始状态
			if (null == customRefreshView)
			{
				pullDownView.startAnimation(reverseDownAnimation);
				refreshStateImageView.setVisibility(View.GONE);
				refreshStateTextView.setText(R.string.pull_to_refresh);
				pullDownView.setVisibility(View.VISIBLE);
			}
			// 上拉布局初始状态
			if (null == customLoadmoreView)
			{
				pullUpView.startAnimation(reverseDownAnimation);
				loadStateImageView.setVisibility(View.GONE);
				loadStateTextView.setText(R.string.pullup_to_load);
				pullUpView.setVisibility(View.VISIBLE);
			}
			break;
		case RELEASE_TO_REFRESH:
			if (null != mOnRefreshProcessListener)
			{
				mOnRefreshProcessListener.onStart(refreshView,
						OnPullProcessListener.REFRESH);
			}
			// 释放刷新状态
			if (null == customRefreshView)
			{
				refreshStateTextView.setText(R.string.release_to_refresh);
				pullDownView.startAnimation(reverseUpAnimation);
			}
			break;
		case REFRESHING:
			if (null != mOnRefreshProcessListener)
			{
				mOnRefreshProcessListener.onHandling(refreshView,
						OnPullProcessListener.REFRESH);
			}
			// 正在刷新状态
			if (null == customRefreshView)
			{
				pullDownView.clearAnimation();
				refreshingView.setVisibility(View.VISIBLE);
				pullDownView.setVisibility(View.INVISIBLE);
				refreshingView.startAnimation(refreshingAnimation);
				refreshStateTextView.setText(R.string.refreshing);
			}
			break;
		case RELEASE_TO_LOAD:
			if (null != mOnLoadmoreProcessListener)
			{
				mOnLoadmoreProcessListener.onStart(loadmoreView,
						OnPullProcessListener.LOADMORE);
			}
			// 释放加载状态
			if (null == customLoadmoreView)
			{
				loadStateTextView.setText(R.string.release_to_load);
				pullUpView.startAnimation(reverseUpAnimation);
			}
			break;
		case LOADING:
			// 正在加载状态
			if (null != mOnLoadmoreProcessListener)
			{
				mOnLoadmoreProcessListener.onHandling(loadmoreView,
						OnPullProcessListener.LOADMORE);
			}
			if (null == customLoadmoreView)
			{
				pullUpView.clearAnimation();
				loadingView.setVisibility(View.VISIBLE);
				pullUpView.setVisibility(View.INVISIBLE);
				loadingView.startAnimation(refreshingAnimation);
				loadStateTextView.setText(R.string.loading);
			}
			break;
		case DONE:
			refreshView.setVisibility(View.VISIBLE);
			loadmoreView.setVisibility(View.VISIBLE);
			break;
		}
	}

	/**
	 * 不限制上拉或下拉
	 */
	private void releasePull()
	{
		mCanPullDown = true;
		mCanPullUp = true;
	}

	/**
	 * 设置是否可下拉刷新
	 * 
	 * @param pullDownEnable
	 */
	public void setPullDownEnable(boolean pullDownEnable)
	{
		mPullDownEnable = pullDownEnable;
	}

	/**
	 * 设置是否可上拉刷新
	 */
	public void setPullUpEnable(boolean pullUpEnable)
	{
		mPullUpEnable = pullUpEnable;
	}

	/*
	 * （非 Javadoc）由父控件决定是否分发事件，防止事件冲突
	 * 
	 * @see android.view.ViewGroup#dispatchTouchEvent(android.view.MotionEvent)
	 */
	@Override
	public boolean dispatchTouchEvent(MotionEvent ev)
	{
		switch (ev.getActionMasked())
		{
		case MotionEvent.ACTION_DOWN:
			downY = ev.getY();
			lastY = downY;
			timer.cancel();
			mEvents = 0;
			releasePull();
			break;
		case MotionEvent.ACTION_POINTER_DOWN:
		case MotionEvent.ACTION_POINTER_UP:
			// 过滤多点触碰
			mEvents = -1;
			break;
		case MotionEvent.ACTION_MOVE:
			if (null != mOnRefreshProcessListener)
			{
				mOnRefreshProcessListener.onPull(refreshView, pullDownY,
						OnPullProcessListener.REFRESH);
			}
			if (null != mOnLoadmoreProcessListener)
			{
				mOnLoadmoreProcessListener.onPull(loadmoreView, pullUpY,
						OnPullProcessListener.LOADMORE);
			}
			if (mEvents == 0)
			{
				if (pullDownY > 0
						|| (((Pullable) pullableView).canPullDown()
								&& mCanPullDown && mPullDownEnable && state != LOADING))
				{
					// 可以下拉，正在加载时不能下拉
					// 对实际滑动距离做缩小，造成用力拉的感觉
					pullDownY = pullDownY + (ev.getY() - lastY) / radio;
					if (pullDownY < 0)
					{
						pullDownY = 0;
						mCanPullDown = false;
						mCanPullUp = true;
					}
					if (pullDownY > getMeasuredHeight())
						pullDownY = getMeasuredHeight();
					if (state == REFRESHING)
					{
						// 正在刷新的时候触摸移动
						isTouch = true;
					}
				} else if (pullUpY < 0
						|| (((Pullable) pullableView).canPullUp() && mCanPullUp
								&& mPullUpEnable && state != REFRESHING))
				{
					// 可以上拉，正在刷新时不能上拉
					pullUpY = pullUpY + (ev.getY() - lastY) / radio;
					if (pullUpY > 0)
					{
						pullUpY = 0;
						mCanPullDown = true;
						mCanPullUp = false;
					}
					if (pullUpY < -getMeasuredHeight())
						pullUpY = -getMeasuredHeight();
					if (state == LOADING)
					{
						// 正在加载的时候触摸移动
						isTouch = true;
					}
				} else
					releasePull();
			} else
				mEvents = 0;
			lastY = ev.getY();
			// 根据下拉距离改变比例
			radio = (float) (2 + 2 * Math.tan(Math.PI / 2 / getMeasuredHeight()
					* (pullDownY + Math.abs(pullUpY))));
			if (pullDownY > 0 || pullUpY < 0)
				requestLayout();
			if (pullDownY > 0)
			{
				if (pullDownY <= refreshDist
						&& (state == RELEASE_TO_REFRESH || state == DONE))
				{
					// 如果下拉距离没达到刷新的距离且当前状态是释放刷新，改变状态为下拉刷新
					changeState(INIT);
				}
				if (pullDownY >= refreshDist && state == INIT)
				{
					// 如果下拉距离达到刷新的距离且当前状态是初始状态刷新，改变状态为释放刷新
					changeState(RELEASE_TO_REFRESH);
				}
			} else if (pullUpY < 0)
			{
				// 下面是判断上拉加载的，同上，注意pullUpY是负值
				if (-pullUpY <= loadmoreDist
						&& (state == RELEASE_TO_LOAD || state == DONE))
				{
					changeState(INIT);
				}
				// 上拉操作
				if (-pullUpY >= loadmoreDist && state == INIT)
				{
					changeState(RELEASE_TO_LOAD);
				}

			}
			// 因为刷新和加载操作不能同时进行，所以pullDownY和pullUpY不会同时不为0，因此这里用(pullDownY +
			// Math.abs(pullUpY))就可以不对当前状态作区分了
			if ((pullDownY + Math.abs(pullUpY)) > 8)
			{
				// 防止下拉过程中误触发长按事件和点击事件
				ev.setAction(MotionEvent.ACTION_CANCEL);
			}
			break;
		case MotionEvent.ACTION_UP:
			if (pullDownY > refreshDist || -pullUpY > loadmoreDist)
			// 正在刷新时往下拉（正在加载时往上拉），释放后下拉头（上拉头）不隐藏
			{
				isTouch = false;
			}
			if (state == RELEASE_TO_REFRESH)
			{
				changeState(REFRESHING);
				// 刷新操作
				if (mListener != null)
					mListener.onRefresh(this);
			} else if (state == RELEASE_TO_LOAD)
			{
				changeState(LOADING);
				// 加载操作
				if (mListener != null)
					mListener.onLoadMore(this);
			}
			hide();
		default:
			break;
		}
		// 事件分发交给父类
		super.dispatchTouchEvent(ev);
		return true;
	}

	/**
	 * @author chenjing 自动模拟手指滑动的task
	 */
	private class AutoRefreshAndLoadTask extends
			AsyncTask<Integer, Float, String>
	{

		@Override
		protected String doInBackground(Integer... params)
		{
			while (pullDownY < 4 / 3 * refreshDist)
			{
				pullDownY += mMoveSpeed;
				publishProgress(pullDownY);
				try
				{
					Thread.sleep(params[0]);
				} catch (InterruptedException e)
				{
					e.printStackTrace();
				}
			}
			return null;
		}

		@Override
		protected void onPostExecute(String result)
		{
			changeState(REFRESHING);
			// 刷新操作
			if (mListener != null)
				mListener.onRefresh(PullToRefreshLayout.this);
			hide();
		}

		@Override
		protected void onProgressUpdate(Float... values)
		{
			if (pullDownY > refreshDist)
				changeState(RELEASE_TO_REFRESH);
			requestLayout();
		}

	}

	/**
	 * 自动刷新
	 */
	public void autoRefresh()
	{
		loadmoreView.setVisibility(View.GONE);
		AutoRefreshAndLoadTask task = new AutoRefreshAndLoadTask();
		task.execute(20);
	}

	/**
	 * 自动加载
	 */
	public void autoLoad()
	{
		refreshView.setVisibility(View.GONE);
		pullUpY = -loadmoreDist;
		requestLayout();
		changeState(LOADING);
		// 加载操作
		if (mListener != null)
			mListener.onLoadMore(this);
	}

	private void initView()
	{
		// 初始化下拉布局
		if (null == customRefreshView)
		{
			pullDownView = defaultRefreshView.findViewById(R.id.pull_icon);
			refreshStateTextView = (TextView) defaultRefreshView
					.findViewById(R.id.state_tv);
			refreshingView = defaultRefreshView
					.findViewById(R.id.refreshing_icon);
			refreshStateImageView = defaultRefreshView
					.findViewById(R.id.state_iv);
		}
		// 初始化上拉布局
		if (null == customLoadmoreView)
		{
			pullUpView = defaultLoadmoreView.findViewById(R.id.pullup_icon);
			loadStateTextView = (TextView) defaultLoadmoreView
					.findViewById(R.id.loadstate_tv);
			loadingView = defaultLoadmoreView.findViewById(R.id.loading_icon);
			loadStateImageView = defaultLoadmoreView
					.findViewById(R.id.loadstate_iv);
		}
	}

	@Override
	protected void onLayout(boolean changed, int l, int t, int r, int b)
	{
		if (!isLayout)
		{
			// 这里是第一次进来的时候做一些初始化
			getPullableView();
			isLayout = true;
			initView();
			refreshDist = ((ViewGroup) refreshView).getChildAt(0)
					.getMeasuredHeight();
			loadmoreDist = ((ViewGroup) loadmoreView).getChildAt(0)
					.getMeasuredHeight();
		}
		// 改变子控件的布局，这里直接用(pullDownY + pullUpY)作为偏移量，这样就可以不对当前状态作区分
		refreshView.layout(0,
				(int) (pullDownY + pullUpY) - refreshView.getMeasuredHeight(),
				refreshView.getMeasuredWidth(), (int) (pullDownY + pullUpY));
		pullableView.layout(0, (int) (pullDownY + pullUpY),
				pullableView.getMeasuredWidth(), (int) (pullDownY + pullUpY)
						+ pullableView.getMeasuredHeight());
		loadmoreView.layout(0,
				(int) (pullDownY + pullUpY) + pullableView.getMeasuredHeight(),
				loadmoreView.getMeasuredWidth(),
				(int) (pullDownY + pullUpY) + pullableView.getMeasuredHeight()
						+ loadmoreView.getMeasuredHeight());
	}

	class MyTimer
	{
		private Handler handler;
		private Timer timer;
		private MyTask mTask;

		public MyTimer(Handler handler)
		{
			this.handler = handler;
			timer = new Timer();
		}

		public void schedule(long period)
		{
			if (mTask != null)
			{
				mTask.cancel();
				mTask = null;
			}
			mTask = new MyTask(handler);
			timer.schedule(mTask, 0, period);
		}

		public void cancel()
		{
			if (mTask != null)
			{
				mTask.cancel();
				mTask = null;
			}
		}

		class MyTask extends TimerTask
		{
			private Handler handler;

			public MyTask(Handler handler)
			{
				this.handler = handler;
			}

			@Override
			public void run()
			{
				handler.obtainMessage().sendToTarget();
			}

		}
	}

	/**
	 * 刷新结果停留的handler
	 */
	static class RemainHandler extends Handler
	{
		private WeakReference<PullToRefreshLayout> mLayout;

		public RemainHandler(PullToRefreshLayout layout)
		{
			mLayout = new WeakReference<PullToRefreshLayout>(layout);
		}

		@Override
		public void handleMessage(Message msg)
		{
			PullToRefreshLayout layout = mLayout.get();
			if (null != layout)
			{
				layout.changeState(DONE);
				layout.hide();
			}
		}
	}

	/**
	 * 执行自动回滚的handler
	 */
	static class UpdateHandler extends Handler
	{
		private WeakReference<PullToRefreshLayout> mLayout;

		public UpdateHandler(PullToRefreshLayout layout)
		{
			mLayout = new WeakReference<PullToRefreshLayout>(layout);
		}

		@Override
		public void handleMessage(Message msg)
		{
			PullToRefreshLayout layout = mLayout.get();
			if (null != layout)
			{
				// 回弹速度随下拉距离moveDeltaY增大而增大
				layout.mMoveSpeed = (float) (8 + 5 * Math.tan(Math.PI / 2
						/ layout.getMeasuredHeight()
						* (layout.pullDownY + Math.abs(layout.pullUpY))));
				if (!layout.isTouch)
				{
					// 正在刷新，且没有往上推的话则悬停，显示"正在刷新..."
					if (layout.state == REFRESHING
							&& layout.pullDownY <= layout.refreshDist)
					{
						layout.pullDownY = layout.refreshDist;
						layout.timer.cancel();
					} else if (layout.state == LOADING
							&& -layout.pullUpY <= layout.loadmoreDist)
					{
						layout.pullUpY = -layout.loadmoreDist;
						layout.timer.cancel();
					}

				}
				if (layout.pullDownY > 0)
					layout.pullDownY -= layout.mMoveSpeed;
				else if (layout.pullUpY < 0)
					layout.pullUpY += layout.mMoveSpeed;
				if (layout.pullDownY < 0)
				{
					// 已完成回弹
					layout.pullDownY = 0;
					if (null == layout.customRefreshView)
					{
						layout.pullDownView.clearAnimation();
					}
					// 隐藏下拉头时有可能还在刷新，只有当前状态不是正在刷新时才改变状态
					if (layout.state != REFRESHING && layout.state != LOADING)
						layout.changeState(INIT);
					layout.timer.cancel();
					layout.requestLayout();
				}
				if (layout.pullUpY > 0)
				{
					// 已完成回弹
					layout.pullUpY = 0;
					if (null == layout.customLoadmoreView)
					{
						layout.pullUpView.clearAnimation();
					}
					// 隐藏上拉头时有可能还在刷新，只有当前状态不是正在刷新时才改变状态
					if (layout.state != REFRESHING && layout.state != LOADING)
						layout.changeState(INIT);
					layout.timer.cancel();
					layout.requestLayout();
				}
				// 刷新布局,会自动调用onLayout
				layout.requestLayout();
				// 没有拖拉或者回弹完成
				if (layout.pullDownY + Math.abs(layout.pullUpY) == 0)
					layout.timer.cancel();
			}
		}

	}

	;

	public void setOnPullListener(OnPullListener listener)
	{
		mListener = listener;
	}

	/**
	 * 设置下拉刷新过程监听器
	 * 
	 * @param onPullProcessListener
	 */
	public void setOnRefreshProcessListener(
			OnPullProcessListener onPullProcessListener)
	{
		mOnRefreshProcessListener = onPullProcessListener;
	}

	/**
	 * 设置上拉加载更多过程监听器
	 * 
	 * @param onPullProcessListener
	 */
	public void setOnLoadmoreProcessListener(
			OnPullProcessListener onPullProcessListener)
	{
		mOnLoadmoreProcessListener = onPullProcessListener;
	}

	/**
	 * 刷新加载回调接口
	 * 
	 * @author chenjing
	 */
	public static interface OnPullListener
	{
		/**
		 * 刷新操作
		 */
		public void onRefresh(PullToRefreshLayout pullToRefreshLayout);

		/**
		 * 加载操作
		 */
		public void onLoadMore(PullToRefreshLayout pullToRefreshLayout);
	}

	/**
	 * 下拉刷新或上拉加载更多过程监听器
	 * 
	 * @author LynnChurch
	 */
	public static interface OnPullProcessListener
	{
		public static final int REFRESH = 1; // 刷新

		public static final int LOADMORE = 2; // 加载更多

		/**
		 * 准备 （提示下拉刷新或上拉加载更多）
		 * 
		 * @param v
		 * @param which
		 *            刷新或加载更多
		 */
		public void onPrepare(View v, int which);

		/**
		 * 开始 （提示释放刷新或释放加载更多）
		 * 
		 * @param v
		 * @param which
		 *            刷新或加载更多
		 */
		public void onStart(View v, int which);

		/**
		 * 处理中
		 * 
		 * @param v
		 * @param which
		 *            刷新或加载更多
		 */
		public void onHandling(View v, int which);

		/**
		 * 完成
		 * 
		 * @param v
		 * @param which
		 *            刷新或加载更多
		 */
		public void onFinish(View v, int which);

		/**
		 * 用于获取拉取的距离
		 * 
		 * @param v
		 * @param pullDistance
		 * @param which
		 *            刷新或加载更多
		 */
		public void onPull(View v, float pullDistance, int which);
	}


}
